/*
* Copyright (C) 1996-2001  Internet Software Consortium.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM
* DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
* INTERNET SOFTWARE CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
* FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
* NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/

/*
* ====================================================================
* Copyright (c) 2013-2014 Neudesic.  All rights reserved.

* This source file includes software written by Neudesic, LLC (http://www.neudesic.com).
*
* THIS SOFTWARE IS PROVIDED BY Neudesic, LLC ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY, NON-INFRINGEMENT, AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  FURTHER, IN NO EVENT SHALL
* Neudesic, LLC (THE AUTHOR) OR ANY CONTRIBUTORS BE LIABLE FOR ANY DAMAGES
* WHATSOEVER THAT ARE RELATED TO THE SOFTWARE [INCLUDING BUT NOT LIMITED TO,
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* SUCH AS LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION, HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)] EVEN IF ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGES.
*
* ====================================================================
*/
#include "winrtsock.h"
#include <errno.h>

#define NS_INT16SZ       2
#define NS_INADDRSZ      4
#define NS_IN6ADDRSZ    16

/*
* WARNING: Don't even consider trying to compile this on a system where
* sizeof(int) < 4.  sizeof(int) > 4 is fine; all the world's not a VAX.
*/

#ifdef __cplusplus
extern "C" {
#endif
	static int inet_pton4(const char *src, unsigned char *dst);
	static int inet_pton6(const char *src, unsigned char *dst);
#ifdef __cplusplus
}
#endif

/* int
* isc_net_pton(af, src, dst)
*      convert from presentation format (which usually means ASCII printable)
*      to network format (which is usually some kind of binary format).
* return:
*      1 if the address was valid for the specified address family
*      0 if the address wasn't valid (`dst' is untouched in this case)
*      -1 if some other error occurred (`dst' is untouched in this case, too)
* author:
*      Paul Vixie, 1996.
*/
int inet_pton(int af, const char *src, void *dst)
{
	switch (af)
	{
	case AF_INET:
		return (inet_pton4(src, (unsigned char*)dst));
	case AF_INET6:
		return (inet_pton6(src, (unsigned char*)dst));
	default:
		errno = EAFNOSUPPORT;
		return (-1);
	}
	/* NOTREACHED */
}

/* int
* inet_pton4(src, dst)
*      like inet_aton() but without all the hexadecimal and shorthand.
* return:
*      1 if `src' is a valid dotted quad, else 0.
* notice:
*      does not touch `dst' unless it's returning 1.
* author:
*      Paul Vixie, 1996.
*/
static int inet_pton4(const char *src, unsigned char *dst)
{
	static const char digits[] = "0123456789";
	int saw_digit, octets, ch;
	unsigned char tmp[NS_INADDRSZ], *tp;

	saw_digit = 0;
	octets = 0;
	*(tp = tmp) = 0;
	while ((ch = *src++) != '\0')
	{
		const char *pch;

		if ((pch = strchr(digits, ch)) != NULL)
		{
			unsigned int _new = *tp * 10 + (pch - digits);

			if (_new > 255)
				return (0);
			*tp = _new;
			if (!saw_digit)
			{
				if (++octets > 4)
					return (0);
				saw_digit = 1;
			}
		}
		else if (ch == '.' && saw_digit)
		{
			if (octets == 4)
				return (0);
			*++tp = 0;
			saw_digit = 0;
		}
		else
			return (0);
	}
	if (octets < 4)
		return (0);
	memcpy(dst, tmp, NS_INADDRSZ);
	return (1);
}

/* int
* inet_pton6(src, dst)
*      convert presentation level address to network order binary form.
* return:
*      1 if `src' is a valid [RFC1884 2.2] address, else 0.
* notice:
*      (1) does not touch `dst' unless it's returning 1.
*      (2) :: in a full address is silently ignored.
* credit:
*      inspired by Mark Andrews.
* author:
*      Paul Vixie, 1996.
*/
static int inet_pton6(const char *src, unsigned char *dst)
{
	static const char xdigits_l[] = "0123456789abcdef",
		xdigits_u[] = "0123456789ABCDEF";
	unsigned char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
	const char *xdigits, *curtok;
	int ch, saw_xdigit;
	unsigned int val;

	//=========================================================================
	//IPV6 loopback address was causing a problem. Handle it here.
	//Does it look like an IPV6 loopback address?
	if (strcmp("::1", src) == 0)
	{
		in6_addr addr; //= { "", 0, 0, 0, 0, 0, 0, 0, 256 };
		ZeroMemory(&addr, sizeof(in6_addr));
		addr.u.Word[7] = 256;
		memcpy_s((void*)dst, sizeof(in6_addr), &addr, sizeof(in6_addr));
		return 1;
	}
	//=========================================================================
	memset((tp = tmp), '\0', NS_IN6ADDRSZ);
	endp = tp + NS_IN6ADDRSZ;
	colonp = NULL;
	/* Leading :: requires some special handling. */
	if (*src == ':')
		if (*++src != ':')
			return (0);
	curtok = src;
	saw_xdigit = 0;
	val = 0;
	//=========================================================================
	//Testing on Windows 8 discovered that IPV6 addresses may end in an encoded
	//string. Must stop at beginning of encoding.
	while ((ch = *src++) != '\0' && (ch != '%'))
	//=========================================================================
	{
		const char *pch;

		if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
			pch = strchr((xdigits = xdigits_u), ch);
		if (pch != NULL)
		{
			val <<= 4;
			val |= (pch - xdigits);
			if (val > 0xffff)
				return (0);
			saw_xdigit = 1;
			continue;
		}
		if (ch == ':')
		{
			curtok = src;
			if (!saw_xdigit)
			{
				if (colonp)
					return (0);
				colonp = tp;
				continue;
			}
			if (tp + NS_INT16SZ > endp)
				return (0);
			*tp++ = (unsigned char)(val >> 8) & 0xff;
			*tp++ = (unsigned char)val & 0xff;
			saw_xdigit = 0;
			val = 0;
			continue;
		}
		if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
			inet_pton4(curtok, tp) > 0)
		{
			tp += NS_INADDRSZ;
			saw_xdigit = 0;
			break;  /* '\0' was seen by inet_pton4(). */
		}
		return (0);
	}
	if (saw_xdigit)
	{
		if (tp + NS_INT16SZ > endp)
			return (0);
		*tp++ = (unsigned char)(val >> 8) & 0xff;
		*tp++ = (unsigned char)val & 0xff;
	}
	if (colonp != NULL)
	{
		/*
		* Since some memmove()'s erroneously fail to handle
		* overlapping regions, we'll do the shift by hand.
		*/
		const int n = tp - colonp;
		int i;

		for (i = 1; i <= n; i++)
		{
			endp[-i] = colonp[n - i];
			colonp[n - i] = 0;
		}
		tp = endp;
	}
	if (tp != endp)
		return (0);
	memcpy((void*)dst, tmp, NS_IN6ADDRSZ);
	return (1);
}